Autoprefixer CLI is deprecated. Use postcss-cli instead.

[Andreyco]

https://github.com/postcss/autoprefixer#cli

Similar to #570, where they require to replace Autoprefixer with CSSNext.

[nicholaspetersen]

I'm having the same issue

[johnchourajr]

Me as well.

[markhowellsmead]

Same here.

[bdkjones]

You can safely ignore this warning. I'll make sure it's silenced in the next update.

[ghost]

Hi, Bryan.

I'm getting the same error, but I've looked at my compiled CSS and Autoprefixer isn't working.

Autoprefixer failed with this error: Autoprefixer CLI is deprecated. Use postcss-cli instead.

[bdkjones]

Please show me the output you're getting and what it should be. Thanks.

[kylegillen]

I'm having the same issue, but only ever since upgrading to OS X El Capitan 10.11. Also seeing the following warning alongside the aforementioned:

Ignoring ffi-1.9.6 because its extensions are not built. Try: gem pristine ffi --version 1.9.6

@bdkjones did mention that it may be conflicting gems, I uninstalled all system gems and am still having the same issue. Any ideas?

[mauricenaef]

Having the same issues as @nextriot. Any update on the problem? Looks like it has to to with the new way El Capitan handles System Integrity Protection (SIP)? Thanks.

[bdkjones]

Autoprefixer is not a Ruby-based tool; it's built on Node and JavaScript. The gem issues should not be related to AP.

[jamiedumont]

Ongoing issue for me too. Autofixer no longer works and produces the above error when enabled.

[razorfever]

I just had the same issue for the first time. I'm still running Yosemite though.

[bdkjones]

Autoprefixer should be running just fine, despite the annoying warning. If AP is not generating the output you expect, please post a test file I can use over here and the A) Expected and B) Actual output you're getting. Please also be sure to specify the browser string you've set for AP in the project settings area.

[bdkjones]

Oh. Just saw the "internal error" in the screenshot above. That is not related to the warning about the CLI deprecation.

Usually, "internal error" means that your Browser String is invalid. (AutoPrefixer doesn't have the best error messages.) It can also show up if your CSS is not valid.

[razorfever]

@bdkjones Thanks for the reply. I managed to sort out my problems with the autoprefixer based on your advice above. I had commented the only line in my sass block like this:

.ui.grid-cell {
/* height: 56px; */
}

Commenting the whole block seems to have cleared the forementioned issue I was having. Still getting the warning about Autoprefixer CLI being deprecated, but it still runs through ok.